A new centre-back remains a top priority for the Red Devils after missing out on a number of targets during Jose Mourinho's final six months in charge.

Koulibaly has emerged as United's favoured option, but Napoli are believed to reluctant to sell the 23-year-old midway through the season.

ESPN suggests that three others have been identified to join the Premier League giants if Napoli refuse to budge on their not-for-sale stance, though United are willing to wait until the summer to land their man.

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